package com.jxust.filter;

import com.jxust.utils.CurrentHolder;
import com.jxust.utils.JwtUtils;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Slf4j
//@WebFilter (urlPatterns = "/*")
public class TokenFilter implements Filter {
     @Override
     public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
         HttpServletRequest request = (HttpServletRequest) servletRequest;
         HttpServletResponse response = (HttpServletResponse) servletResponse;

         //1.获取请求
         String requestURI = request.getRequestURI();

         //2.判断是否是登录请求，如果路径中包含/login 说明是登录操作放行
         if(requestURI.contains("/login")){
             log.info("登录请求，放行");
             filterChain.doFilter(request,response);
             return;
         }
         //3. 获取请求头中的token
         String token = request.getHeader("token");

         //4.判断token是否存在返回错误信息(401)
         if(token==null||token.isEmpty()){
             log.info("令牌为空,响应401");
             response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
             return;
         }
         //5.如果令牌存在校验令牌，失败401
        try {
             Claims claims = JwtUtils.parseToken(token);
             Integer empId =Integer.valueOf(claims.get("id").toString());
             CurrentHolder.setCurrentId(empId);
             log.info("当前用户id为：{},将其存入ThreadLocal",empId);
        } catch (Exception e) {
            log.info("令牌验证失败，响应401");
            response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
            return;
        }
         //6.通过放行
         log.info("令牌验证成功，放行");
         filterChain.doFilter(request,response);

         //7.删除ThreadLocal中的数据
         CurrentHolder.remove();
     }
}
